Pressure adjusting device of hydrochloric acid storage tank

Abstract

The utility model discloses a hydrochloric acid storage tank pressure adjusting device which comprises a positive pressure liquid seal tank, a negative pressure liquid seal tank, an exhaust pipe and an air inlet pipe, the positive pressure liquid seal tank is provided with a positive pressure liquid seal groove, an exhaust port and a first communication port, liquid in the positive pressure liquid seal groove forms a first liquid level surface, the upper end of the exhaust pipe is communicated with a hydrochloric acid storage tank through the first communication port, and the lower end of the exhaust pipe is communicated with the air inlet pipe. The lower end of the exhaust pipe is lower than the first liquid level surface; the negative pressure liquid seal tank is provided with a negative pressure liquid seal groove, an air inlet and a second communication port used for being connected with the hydrochloric acid storage tank, liquid in the negative pressure liquid seal groove forms a second liquid level surface, the upper end of the air inlet pipe is communicated with the external environment through the air inlet, and the lower end of the air inlet pipe is lower than the second liquid level surface. The positive-pressure liquid sealing tank and the negative-pressure liquid sealing tank form a positive-negative pressure adjusting system, the pressure of the hydrochloric acid storage tank can be automatically adjusted and controlled, pressure balance of the hydrochloric acid storage tank is achieved, and the risk of damage to the hydrochloric acid storage tank is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure regulating equipment, specifically to a pressure regulating device for a hydrochloric acid storage tank. Background Technology

[0002] In the production of R22 (difluorochloromethane), hydrochloric acid is generated as a byproduct and is temporarily stored in hydrochloric acid storage tanks. In related technologies, the pressure regulation method for the R22 byproduct hydrochloric acid storage tanks involves introducing a vapor phase pipe at the top into a wastewater tank. When the pressure inside the hydrochloric acid storage tank is too high, gas is discharged through the vapor phase pipe. However, in actual production, negative pressure situations can also occur inside the hydrochloric acid storage tanks, especially during the continuous acid filling process. The rapid drop in the hydrochloric acid level creates negative pressure inside the tank, increasing the risk of the tank collapsing. In severe cases, this can lead to tank rupture, posing a significant safety risk. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a hydrochloric acid storage tank pressure regulating device, in which a positive pressure liquid seal tank and a negative pressure liquid seal tank form a positive and negative pressure regulating system, which can automatically regulate and control the pressure of the hydrochloric acid storage tank, achieve pressure balance of the hydrochloric acid storage tank, and reduce the risk of damage to the hydrochloric acid storage tank.

[0005] The hydrochloric acid storage tank pressure regulating device of this utility model includes a positive pressure liquid seal tank, a negative pressure liquid seal tank, an exhaust pipe, and an air inlet pipe. The positive pressure liquid seal tank has a positive pressure liquid seal groove, an exhaust port, and a first connecting port. The exhaust port and the first connecting port are both connected to the positive pressure liquid seal groove. The liquid in the positive pressure liquid seal groove forms a first liquid level. The upper end of the exhaust pipe is connected to the hydrochloric acid storage tank through the first connecting port, and the lower end of the exhaust pipe is lower than the first liquid level. The negative pressure liquid seal tank has a negative pressure liquid seal groove, an air inlet, and a second connecting port for connecting to the hydrochloric acid storage tank. The air inlet and the second connecting port are both connected to the negative pressure liquid seal groove. The liquid in the negative pressure liquid seal groove forms a second liquid level. The upper end of the air inlet pipe is connected to the external environment through the air inlet, and the lower end of the air inlet pipe is lower than the second liquid level.

[0006] In some embodiments, the lower end of the exhaust pipe is spaced apart from the first liquid level to form a positive pressure liquid seal water column, and the lower end of the intake pipe is spaced apart from the second liquid level to form a negative pressure liquid seal water column, wherein the height of the positive pressure liquid seal water column is less than the height of the negative pressure liquid seal water column.

[0007] In some embodiments, the height of the positive pressure liquid seal water column is 200mm to 350mm, and the height of the negative pressure liquid seal water column is 450mm to 600mm.

[0008] In some embodiments, the negative pressure liquid seal tank has a liquid seal port communicating with the negative pressure liquid seal trough, and the pressure regulating device further includes a liquid seal pipe, the liquid seal pipe including a first pipe section, a second pipe section and a third pipe section connected in sequence, the first pipe section and the third pipe section being lower than the second pipe section, the first pipe section communicating with the liquid seal port, so as to limit the second liquid level using the liquid seal pipe.

[0009] In some embodiments, at least one of the positive pressure liquid seal tank and the negative pressure liquid seal tank has a drain outlet.

[0010] In some embodiments, the negative pressure liquid seal tank has a drain outlet, the height of which is equal to the height of the liquid seal opening.

[0011] In some embodiments, the drain outlet is connected to a drain pipe, and the drain pipe is connected to a drain valve to control the opening and closing of the drain outlet.

[0012] In some embodiments, at least one of the positive pressure liquid seal tank and the negative pressure liquid seal tank has a water inlet.

[0013] In some embodiments, the water inlet is connected to a water inlet pipe, and the water inlet pipe is connected to a water inlet valve to control the opening and closing of the water inlet pipe.

[0014] In some embodiments, the pressure regulating device further includes a first connecting valve and a second connecting valve. The first connecting valve is disposed at the first connecting port to control the opening and closing of the first connecting port. The second connecting valve is disposed at the second connecting port to control the opening and closing of the second connecting port.

[0015] This utility model's hydrochloric acid storage tank pressure regulating device comprises a positive pressure liquid seal tank and a negative pressure liquid seal tank, forming a positive and negative pressure regulating system. This system can automatically regulate and control the pressure of the hydrochloric acid storage tank, achieving pressure balance. When the pressure inside the hydrochloric acid storage tank is too high, high-pressure gas enters the water body of the positive pressure liquid seal tank through the exhaust pipe, breaking the water layer of the positive pressure liquid seal water column. The gas is then discharged to the external environment through the exhaust port, thereby reducing the internal pressure of the hydrochloric acid storage tank and preventing overpressure damage. When the pressure inside the hydrochloric acid storage tank returns to a preset value, the water layer automatically closes, stopping the exhaust. Furthermore, when the gas from the hydrochloric acid storage tank is discharged through the positive pressure liquid seal tank, the hydrochloric acid tail gas carried in the gas is absorbed by the water body in the positive pressure liquid seal tank, ensuring the safety of the discharged gas. When the pressure inside the hydrochloric acid storage tank is too low, air from the outside environment enters the water body of the negative pressure liquid seal tank through the air inlet pipe, pushes open the water layer of the negative pressure liquid seal water column, and then enters the hydrochloric acid storage tank through the second connecting port, thereby increasing the internal pressure of the hydrochloric acid storage tank and preventing the risk of the hydrochloric acid storage tank collapsing or even rupturing due to negative pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a hydrochloric acid storage tank pressure regulating device according to an embodiment of the present invention.

[0017] Figure label:

[0018] 100. Hydrochloric acid storage tank pressure regulating device;

[0019] 1. Positive pressure liquid seal tank; 11. Positive pressure liquid seal trough; 12. Exhaust port; 121. Exhaust valve; 13. First connecting port; 14. First liquid level; 15. Drain port; 151. Drain valve; 16. Water inlet; 161. Water inlet valve;

[0020] 2. Negative pressure liquid seal tank; 21. Negative pressure liquid seal trough; 22. Air inlet; 23. Second connecting port; 24. Second liquid level; 25. Liquid seal port;

[0021] 3. Exhaust pipe;

[0022] 4. Air intake pipe;

[0023] 5. Liquid seal pipe; 51. First pipe section; 52. Second pipe section; 53. Third pipe section;

[0024] 6. First connecting pipe; 61. First connecting valve;

[0025] 7. Second connecting pipe; 71. Second connecting valve. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] like Figure 1 As shown, the hydrochloric acid storage tank pressure regulating device 100 of this utility model embodiment includes a positive pressure liquid seal tank 1, a negative pressure liquid seal tank 2, an exhaust pipe 3, and an air inlet pipe 4. The positive pressure liquid seal tank 1 has a positive pressure liquid seal groove 11, an exhaust port 12, and a first connecting port 13. The exhaust port 12 and the first connecting port 13 are both connected to the positive pressure liquid seal groove 11. The liquid in the positive pressure liquid seal groove 11 forms a first liquid level 14. The upper end of the exhaust pipe 3 is connected to the hydrochloric acid storage tank through the first connecting port 13, and the lower end of the exhaust pipe 3 is lower than the first liquid level 14. The negative pressure liquid seal tank 2 has a negative pressure liquid seal groove 21, an air inlet 22, and a second connecting port 23 for connecting the hydrochloric acid storage tank. The air inlet 22 and the second connecting port 23 are both connected to the negative pressure liquid seal groove 21. The liquid in the negative pressure liquid seal groove 21 forms a second liquid level 24. The upper end of the air inlet pipe 4 is connected to the external environment through the air inlet 22, and the lower end of the air inlet pipe 4 is lower than the second liquid level 24.

[0028] The hydrochloric acid storage tank pressure regulating device 100 of this utility model embodiment has water bodies with preset liquid levels in both the positive pressure liquid seal tank 11 and the negative pressure liquid seal tank 21. The water body in the positive pressure liquid seal tank 11 forms a first liquid level surface 14, and the water body in the negative pressure liquid seal tank 21 forms a second liquid level surface 24. The exhaust pipe 3 is inserted below the first liquid level surface 14, and the distance between the lower end of the exhaust pipe 3 and the first liquid level surface 14 is the positive pressure liquid seal water column. The air inlet pipe 4 is inserted below the second liquid level surface 24, and the distance between the lower end of the air inlet pipe 4 and the second liquid level surface 24 is the negative pressure liquid seal water column. The positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 form a positive and negative pressure regulating system, which can automatically regulate and control the pressure of the hydrochloric acid storage tank to achieve pressure balance of the hydrochloric acid storage tank.

[0029] When the pressure inside the hydrochloric acid storage tank is too high, high-pressure gas enters the water body of the positive pressure liquid seal tank 11 through the exhaust pipe 3 and pushes open the water layer of the positive pressure liquid seal water column. It is then discharged to the external environment through the exhaust port 12, thereby reducing the internal pressure of the hydrochloric acid storage tank and preventing overpressure damage. When the pressure inside the hydrochloric acid storage tank returns to the preset value, the water layer automatically closes, and venting stops. Furthermore, when the gas from the hydrochloric acid storage tank is discharged through the positive pressure liquid seal tank 11, the hydrochloric acid carried in the gas is absorbed by the water body within the tank, ensuring the safety of the discharged gas.

[0030] When the pressure inside the hydrochloric acid storage tank is too low, air from the outside environment enters the water body of the negative pressure liquid seal tank 21 through the air inlet pipe 4 and pushes open the water layer of the negative pressure liquid seal water column. Then, it enters the hydrochloric acid storage tank through the second connecting port 23, thereby increasing the internal pressure of the hydrochloric acid storage tank and preventing the risk of the hydrochloric acid storage tank collapsing or even rupturing due to negative pressure.

[0031] Therefore, bidirectional pressure balance of hydrochloric acid storage tanks can be achieved without the need for measuring instruments such as level gauges for operation and control. The pressure of hydrochloric acid storage tanks can be automatically adjusted, and the structure is relatively simple with low maintenance costs.

[0032] As an example, such as Figure 1 As shown, the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 are identical in shape and size, and are placed on the same horizontal plane. The first connecting port 13 is arranged on the top wall of the positive pressure liquid seal tank 1, and the second connecting port 23 is arranged on the top wall of the negative pressure liquid seal tank 2. The first connecting port 13 and the second connecting port 23 are connected to the hydrochloric acid storage tank through the same pipe.

[0033] The vent 12 is located on the side wall of the positive pressure liquid seal tank 1 and is positioned in the middle along the height direction of the positive pressure liquid seal tank 1. The vent 12 is equipped with an vent valve 121, which can control the opening and closing of the vent 12. In addition, the height of the first liquid level 14 in the positive pressure liquid seal tank 1 is the same as the height of the vent 12, and the height of the first liquid level 14 can be limited by the vent 12.

[0034] An air inlet 22 is located on the top wall of the negative pressure liquid seal tank 2. An air inlet pipe 4 passes through the air inlet 22, and the upper end of the air inlet pipe 4 is connected to the external environment. Air from the external environment can enter the negative pressure liquid seal tank 21 through the air inlet pipe 4, and then enter the hydrochloric acid storage tank.

[0035] In some embodiments, the lower end of the exhaust pipe 3 is spaced apart from the first liquid level surface 14 to form a positive pressure liquid seal water column, and the lower end of the air inlet pipe 4 is spaced apart from the second liquid level surface 24 to form a negative pressure liquid seal water column. The height H1 of the positive pressure liquid seal water column is less than the height H2 of the negative pressure liquid seal water column.

[0036] In other words, the height of the positive pressure liquid seal water column is less than the height of the negative pressure liquid seal water column. Therefore, when the pressure inside the hydrochloric acid storage tank is too high, the pressure inside the hydrochloric acid storage tank can be discharged through the positive pressure liquid seal tank 11, and the negative pressure liquid seal tank 21 will not spray water, thus ensuring the stable operation of the pressure regulating device.

[0037] In some embodiments, the height H1 of the positive pressure liquid seal water column is 200mm to 350mm, and the height H2 of the negative pressure liquid seal water column is 450mm to 600mm.

[0038] The height of the positive pressure liquid seal water column and the negative pressure liquid seal water column are determined according to the pressure bearing capacity of the hydrochloric acid storage tank. The pressure bearing capacity of the hydrochloric acid storage tank is determined according to parameters such as the diameter of the hydrochloric acid storage tank, the minimum thickness of the tank wall, and the equivalent height. For example, when the diameter of the hydrochloric acid storage tank is 4m, the minimum thickness of the tank wall is 10mm, and the equivalent height is 13m, the critical pressure of the hydrochloric acid storage tank under external pressure is 0.051MPa. Correspondingly, the height of the negative pressure liquid seal water column is 500mm, and the height of the positive pressure liquid seal water column is 300mm.

[0039] Therefore, a relatively stable positive and negative pressure regulation system is formed by positive pressure liquid seal tank 1 and negative pressure liquid seal tank 2 to achieve pressure regulation of hydrochloric acid storage tank and ensure pressure balance of hydrochloric acid storage tank.

[0040] In some embodiments, the negative pressure liquid seal tank 2 has a liquid seal port 25 communicating with the negative pressure liquid seal groove 21, and the pressure regulating device further includes a liquid seal pipe 5, which includes a first pipe section 51, a second pipe section 52 and a third pipe section 53 connected in sequence. The first pipe section 51 and the third pipe section 53 are both lower than the second pipe section 52. The first pipe section 51 is communicating with the liquid seal port 25 so as to limit the second liquid level 24 by means of the liquid seal pipe 5.

[0041] Specifically, such as Figure 1 As shown, the first pipe section 51 and the second pipe section 52 both extend vertically, and the second pipe section 52 extends horizontally. The first pipe section 51, the second pipe section 52 and the third pipe section 53 form a U-shaped liquid seal pipe 5, with the U-shaped opening facing downwards. The liquid seal port 25 is located near the bottom of the negative pressure liquid seal tank 2. The lower end of the first pipe section 51 is connected to the liquid seal port 25 through a pipe, and the lower end of the third pipe section 53 is connected to the sewage tank through a pipe. The liquid seal pipe 5 can limit the height of the second liquid level 24 to be consistent with the height of the second pipe section 52, thereby ensuring the normal operation of the negative pressure liquid seal tank 2.

[0042] In some embodiments, at least one of the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 has a drain outlet 15.

[0043] In some embodiments, the negative pressure liquid seal tank 2 has a drain outlet 15, the height of which is equal to the height of the liquid seal 25.

[0044] In some embodiments, the drain outlet 15 is connected to a drain pipe, and the drain pipe is connected to a drain valve 151, so as to control the opening and closing of the drain outlet 15.

[0045] Specifically, such as Figure 1As shown, both the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 have drain ports 15. The drain port 15 of the positive pressure liquid seal tank 1 is arranged close to the bottom wall of the positive pressure liquid seal tank 1, and the drain port 15 of the negative pressure liquid seal tank 2 is arranged close to the bottom wall of the negative pressure liquid seal tank 2 and is at the same height as the liquid seal opening 25. Both the drain ports 15 of the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 are connected to drain pipes, and drain valves 151 are connected to the drain pipes.

[0046] Therefore, when the hydrochloric acid storage tank pressure regulating device 100 is operating normally, the drain valve 151 is closed. When it is necessary to replace the water in the positive pressure liquid seal tank 1 or the negative pressure liquid seal tank 2, the drain valve 151 is opened to drain the water in the corresponding liquid seal tank.

[0047] In some embodiments, at least one of the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 has a water inlet 16.

[0048] In some embodiments, the inlet 16 is connected to the inlet pipe, and the inlet pipe is connected to the inlet valve 161, so as to control the opening and closing of the inlet pipe through the inlet valve 161.

[0049] Specifically, such as Figure 1 As shown, both the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 have water inlets 16, and both water inlets 16 are connected to water inlet pipes, and both water inlet pipes are connected to a water source through the same pipe; the water inlet pipes are connected to water inlet valves 161, and the opening and closing of the water inlets 16 of the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 can be controlled by the water inlet valves 161.

[0050] Therefore, when the hydrochloric acid storage tank pressure regulating device 100 is operating normally, the inlet valve 161 is closed. When it is necessary to replace the water in the positive pressure liquid seal tank 1 or the negative pressure liquid seal tank 2, the water is first discharged through the drain port 15, and then the inlet valve 161 at the corresponding position is opened to inject water into the corresponding liquid seal tank.

[0051] In some embodiments, the pressure regulating device further includes a first connecting valve 61 and a second connecting valve 71. The first connecting valve 61 is disposed at the first connecting port 13 to control the opening and closing of the first connecting port 13. The second connecting valve 71 is disposed at the second connecting port 23 to control the opening and closing of the second connecting port 23.

[0052] Specifically, such as Figure 1 As shown, the exhaust pipe 3 passes through the first connecting port 13 and is connected to the first connecting pipe 6. The second connecting port 23 is provided with a second connecting pipe 7. The first connecting pipe 6 and the second connecting pipe 7 are connected to the hydrochloric acid storage tank through the same pipe. The first connecting valve 61 is connected to the first connecting pipe 6, and the second connecting valve 71 is connected to the second connecting pipe 7.

[0053] When the hydrochloric acid storage tank pressure regulating device 100 is operating normally, both the first connecting valve 61 and the second connecting valve 71 are open, and both the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 are connected to the hydrochloric acid storage tank, which can realize the automatic regulation of the hydrochloric acid storage tank pressure. When it is necessary to replace the water, the first connecting valve 61 and the second connecting valve 71 are closed, which can disconnect the positive pressure liquid seal tank 1 and the negative pressure liquid seal tank 2 from the hydrochloric acid storage tank.

[0054] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydrochloric acid storage tank pressure regulating device characterized by, The system includes a positive pressure liquid seal tank, a negative pressure liquid seal tank, an exhaust pipe, and an inlet pipe. The positive pressure liquid seal tank has a positive pressure liquid seal groove, an exhaust port, and a first connecting port. Both the exhaust port and the first connecting port are connected to the positive pressure liquid seal groove. The liquid in the positive pressure liquid seal groove forms a first liquid level. The upper end of the exhaust pipe is connected to the hydrochloric acid storage tank through the first connecting port, and the lower end of the exhaust pipe is lower than the first liquid level. The negative pressure liquid seal tank has a negative pressure liquid seal groove, an air inlet, and a second connecting port for connecting to a hydrochloric acid storage tank. Both the air inlet and the second connecting port are connected to the negative pressure liquid seal groove. The liquid in the negative pressure liquid seal groove forms a second liquid level. The upper end of the air inlet pipe is connected to the external environment through the air inlet, and the lower end of the air inlet pipe is lower than the second liquid level.

2. The hydrochloric acid storage tank pressure regulating apparatus according to claim 1, characterized by, The lower end of the exhaust pipe is spaced apart from the first liquid level to form a positive pressure liquid seal water column, and the lower end of the intake pipe is spaced apart from the second liquid level to form a negative pressure liquid seal water column. The height of the positive pressure liquid seal water column is less than the height of the negative pressure liquid seal water column.

3. The hydrochloric acid storage tank pressure regulating apparatus according to claim 2, characterized by, The height of the positive pressure liquid seal water column is 200mm to 350mm, and the height of the negative pressure liquid seal water column is 450mm to 600mm.

4. The hydrochloric acid storage tank pressure regulating apparatus according to claim 1, characterized by, The negative pressure liquid seal tank has a liquid seal port connected to the negative pressure liquid seal trough. The pressure regulating device further includes a liquid seal pipe, which includes a first pipe section, a second pipe section, and a third pipe section connected in sequence. The first pipe section and the third pipe section are both lower than the second pipe section. The first pipe section is connected to the liquid seal port so as to limit the second liquid level using the liquid seal pipe.

5. The hydrochloric acid storage tank pressure regulating apparatus according to claim 4, characterized by, At least one of the positive pressure liquid seal tank and the negative pressure liquid seal tank has a drain outlet.

6. The hydrochloric acid storage tank pressure regulating apparatus according to claim 5, characterized by, The negative pressure liquid seal tank has a drain outlet, the height of which is equal to the height of the liquid seal opening.

7. The hydrochloric acid storage tank pressure regulating apparatus according to claim 5, characterized by The drain outlet is connected to a drain pipe, and the drain pipe is connected to a drain valve, which controls the opening and closing of the drain outlet.

8. The hydrochloric acid storage tank pressure regulating apparatus according to claim 1, characterized by, At least one of the positive pressure liquid seal tank and the negative pressure liquid seal tank has a water inlet.

9. The hydrochloric acid storage tank pressure regulating apparatus according to claim 8, characterized by, The water inlet is connected to the water inlet pipe, and the water inlet pipe is connected to the water inlet valve, so as to control the opening and closing of the water inlet pipe.

10. The hydrochloric acid storage tank pressure regulating apparatus according to claim 1, characterized by, The pressure regulating device further includes a first connecting valve and a second connecting valve. The first connecting valve is located at the first connecting port to control the opening and closing of the first connecting port. The second connecting valve is located at the second connecting port to control the opening and closing of the second connecting port.

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